Three young people in Tokyo. Kuro is a girl working a part-time job at a bakery. Eito is a photographer. Gou is a theater director. These three individuals meet by coincidence and, as a means to escape reality, begin living together at a deserted inn near the sea.

Based on the TV series from the same name, Mentai Piriri stars Hanamaru Hakata, the icon of Hakata, Fukuoka, alongside Yasuko Tomita, who both starred in the television show playing husband and wife respectively. With additional scenes not depicted in the original show.